KROHNE level transmitters provide continuous level measurements, producing an output signal that directly correlates to the level in a tank or vessel. The output signal generated can be used to display the depth or to actuate control functions. KROHNE has a level transmitter for every application and a wide variety of measurement principles. The OPTIWAVE series uses frequency modulated continuous wave (FMCW) radar technology. The OPTIFLEX series uses time domain reflectometry (TDR) guided radar. The OPTISOUND series uses ultrasonic measurements.